<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title>deeeeeeeeeeeeeeemo</title>
</head>
<style type="text/css" media="screen">
    div{
        width:100px;
        height: 100px;
        background：orange;
    }
</style>
<body>
    <div>
        <span>wow</span>
    </div>
</body>
</html>